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A 4073 (OTTOKEMI) (1S,2R)-(−)-cis-1-Amino-2-indanol, 99% Cas 126456-43-7 - used to prepare (-)-1,2,5,6-Tetrahydropyridine by reacting with methyl (E,E)-4-oxo-2-[(2,6,6-trimethylcyclohex-1-enyl)vinyl}but-2-enoate.[3]